package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author: 青肆
 * @date: 2022/8/18 10:54
 * @description: SetmealServiceImpl
 */
@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    //新增套餐，同时需要保存套餐和菜品之间的关联关系

    @Autowired
    private SetmealDishService setmealDishService;

    //添加套餐

    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);//由于setmealDto继承了Setmeal，所以只需要添加setmealDto即可

        //获得setmealDto中的setmealDishes
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

        //集合中只有dishId，没有setmealId
        //若需获得setmealId，则需要运用流的方式赋值
        setmealDishes.stream().map((item) -> {//遍历集合，命名为item
            //获取setmealDto的id，并输入到item中
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        //保存套餐和菜品的关联信息，查询setmeal_dish,执行insert操作
        //批量插入
        setmealDishService.saveBatch(setmealDishes);
    }

    //删除数据

    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {

        // select count(*) from setmeal where id in(1,2,3)and status=1

        //查询套餐状态，确实是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId, ids);
        queryWrapper.eq(Setmeal::getStatus, 1);

        int count = super.count(queryWrapper);
        if (count > 0) {
            //如果不能删除，则抛出异常
            throw new CustomException("套餐正在售卖中，不能删除");
        }

        //如果可以删除，先删除套餐中的数据
        super.removeByIds(ids);

        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId, ids);

        //删除关系表中的数据
        setmealDishService.remove(lambdaQueryWrapper);
    }

    @Override
    public SetmealDto getByIdWithrDish(Long id) {
        //查询菜品基本信息，从setmeal表查询
        Setmeal setmeal = this.getById(id);

        //新建一个对象
        SetmealDto setmealDto = new SetmealDto();

        //将setmeal文件中的简单数据复制到setmealDto中
        BeanUtils.copyProperties(setmeal,setmealDto);

        //查询当前套餐对应的菜品信息，从setmeal_dish表查询
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();

        //要求setmeal和setmealDto的id要相同
        queryWrapper.eq(SetmealDish::getSetmealId,setmeal.getId());

        //取出setmeal中的数据
        List<SetmealDish> list = setmealDishService.list(queryWrapper);

        //将口味数据赋值到setmealDto中
        setmealDto.setSetmealDishes(list);

        return setmealDto;
    }

    //修改套餐
    @Override
    @Transactional
    public void updateWithDish(SetmealDto setmealDto) {
        //更新Setmeal表基本信息
        this.updateById(setmealDto);

        //清理当前菜品对应的口味数据---setmeal_dish表的delete操作
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());

        setmealDishService.remove(queryWrapper);

        //添加当前提交过来的口味数据---setmeal，setmeal_dish表的insert操作
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

        setmealDishes = setmealDishes.stream().map(item -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishes);
    }
}
